Boletín de aludes

Northwest Inland

Mar 23 – 24, 2015Avalanche Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Wed
Thu
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

Watch for wind slabs immediately below ridge crest.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Small wind slabs may exist in the alpine.  Watch for triggering in gullies and in the lee of ridge crests in upper elevation terrain.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Weather Forecast

Tuesday:  Trace amount of snow.  Freezing level rising to around 1300m.  Winds light S/SW at all elevations.Wednesday:  2 to 10cm of new snow.  Light S winds at treeline, Strong to extreme SW winds at ridgetop.  Freezing level starting at valley bottom, rising to 1200m in the afternoon.Thursday:  Scattered flurries.  Strong SW winds at all elevations.  Freezing level holding at 1700m.

Avalanche Summary

Numerous size 1 loose wet avalanches were reported on Saturday. They failed in steep rocky terrain in response to warming and solar radiation.  On Sunday cornice failures to size 2 were reported.

Snowpack Summary

Light accumulations from Friday may now exist as a soft wind slab in high elevation lee terrain. The new snow overlies older wind slabs, crusts and wind-scoured surfaces. Sun-exposed slopes and lower elevation areas are likely in a spring melt-freeze cycle. Weaknesses buried in the upper snowpack may include hard crusts and/or facet crystals, although not much is known about the reactivity or spatial distribution of this layer. At the base of the snowpack, weak facets may be found. Cornices are large and potentially fragile.

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